Malicious PDF — malware analysis report

Static analysis result for SHA-256 d459c2a12554eb56…

MALICIOUS

PDF

83.1 KB Created: 2021-08-24 23:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b94442fa3e56cf1d18f5e9aa96f4dbd5 SHA-1: f8357701c1e4a9762bf69b23aca3077a2eba3566 SHA-256: d459c2a12554eb56590fe897cf251a3527b1c38ac9e4392ff86888651c46a288
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3051

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://thietbimaugiao.vn/Images_upload/files/2758433837.pdf In PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/zarumesumutubukubuwinezed.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/54347515778.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075ceae3dadc---vexijoxerapokage.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c35cebca57---zazubuzefopanamovu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160872601d126b---31297275875.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/getasijiwilebuzasexivon.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45422615395.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/kelizasimi.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/tiliminabomanakefadolenap.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gijosinaralobosuju.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/98205130509.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/8fc3bf8e505de19ca259ea06edf0e7d8/21855110110.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/robexotunixosoxeput.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076f00b617f0---51579689883.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3a5e3046---bewufatesufuzewalodox.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/baa0ed0399bd334fe0ed6c88b640e97e/35608580401.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/rulimijixa.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607032260a2fd---bebuzirazunu.pdfIn PDF document text
    • http://xsteelstock.com/d/files/95197760611.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c662d35160---14280443775.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e4f66d2e---pimutovinimakuri.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/62505521848.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/daxofux.pdfIn PDF document text
    • http://kokalietudarbnica.lv/files/files/31605404285.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/penajiwofevijuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+product+backlog+isPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 16348 bytes
SHA-256: 85fada6a5f09144e84a912ada11a9c3af8364e3c8fb3babc56d96ca2b3116b31
font_01_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F7 10984 bytes
SHA-256: 156ed9a806a9b13b9182542dba4770685bffcadc86a8bec28810d3686db231cc

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